/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */

package com.android.systemui.statusbar.phone;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.android.internal.widget.LockPatternUtils;
import com.android.keyguard.KeyguardViewBase;
import com.android.keyguard.R;
import com.android.keyguard.ViewMediatorCallback;
import com.android.systemui.keyguard.KeyguardViewMediator;

import static com.android.keyguard.KeyguardSecurityModel.*;

/**
 * A class which manages the bouncer on the lockscreen.
 */
public class KeyguardBouncer {

    private Context mContext;
    private ViewMediatorCallback mCallback;
    private LockPatternUtils mLockPatternUtils;
    private ViewGroup mContainer;
    private StatusBarWindowManager mWindowManager;
    private KeyguardViewBase mKeyguardView;
    private ViewGroup mRoot;

    public KeyguardBouncer(Context context, ViewMediatorCallback callback,
            LockPatternUtils lockPatternUtils, StatusBarWindowManager windowManager,
            ViewGroup container) {
        mContext = context;
        mCallback = callback;
        mLockPatternUtils = lockPatternUtils;
        mContainer = container;
        mWindowManager = windowManager;
    }

    public void prepare() {
        ensureView();
    }

    public void show() {
        ensureView();

        // Try to dismiss the Keyguard. If no security pattern is set, this will dismiss the whole
        // Keyguard. If we need to authenticate, show the bouncer.
        if (!mKeyguardView.dismiss()) {
            mRoot.setVisibility(View.VISIBLE);
            mKeyguardView.requestFocus();
            mKeyguardView.onResume();
        }
    }

    public void hide() {
        if (mKeyguardView != null) {
            mKeyguardView.cleanUp();
        }
        removeView();
    }

    /**
     * Reset the state of the view.
     */
    public void reset() {
        inflateView();
    }

    public void onScreenTurnedOff() {
        if (mKeyguardView != null && mRoot != null && mRoot.getVisibility() == View.VISIBLE) {
            mKeyguardView.onPause();
        }
    }

    public long getUserActivityTimeout() {
        if (mKeyguardView != null) {
            long timeout = mKeyguardView.getUserActivityTimeout();
            if (timeout >= 0) {
                return timeout;
            }
        }
        return KeyguardViewMediator.AWAKE_INTERVAL_DEFAULT_MS;
    }

    public boolean isShowing() {
        return mRoot != null && mRoot.getVisibility() == View.VISIBLE;
    }

    private void ensureView() {
        if (mRoot == null) {
            inflateView();
        }
    }

    private void inflateView() {
        removeView();
        mRoot = (ViewGroup) LayoutInflater.from(mContext).inflate(R.layout.keyguard_bouncer, null);
        mKeyguardView = (KeyguardViewBase) mRoot.findViewById(R.id.keyguard_host_view);
        mKeyguardView.setLockPatternUtils(mLockPatternUtils);
        mKeyguardView.setViewMediatorCallback(mCallback);
        mContainer.addView(mRoot, mContainer.getChildCount());
        mRoot.setVisibility(View.INVISIBLE);
        mRoot.setSystemUiVisibility(View.STATUS_BAR_DISABLE_HOME);
    }

    private void removeView() {
        if (mRoot != null && mRoot.getParent() == mContainer) {
            mContainer.removeView(mRoot);
            mRoot = null;
        }
    }

    public boolean onBackPressed() {
        return mKeyguardView != null && mKeyguardView.handleBackKey();
    }

    /**
     * @return True if and only if the current security method should be shown before showing
     *         the notifications on Keyguard, like SIM PIN/PUK.
     */
    public boolean needsFullscreenBouncer() {
        if (mKeyguardView != null) {
            SecurityMode mode = mKeyguardView.getSecurityMode();
            return mode == SecurityMode.SimPin
                    || mode == SecurityMode.SimPuk;
        }
        return false;
    }

    public boolean onMenuPressed() {
        ensureView();
        if (mKeyguardView.handleMenuKey()) {

            // We need to show it in case it is secure. If not, it will get dismissed in any case.
            mRoot.setVisibility(View.VISIBLE);
            mKeyguardView.requestFocus();
            mKeyguardView.onResume();
            return true;
        } else {
            return false;
        }
    }
}